Free-chain planetary hoist



Dec. l5, 1942. F. w. coFFlNG FREE-CHAIN PLANETARY HOIST Original FiledOct. 8, 1937 4 Sheets-Sheet 1 Dec. 15, 1942. F. w. coFFlNG Re. 22,237

FREE-CHAIN PLANETARY f ioIsT Original Filed Oct. 8. 1937 4 Sheets-Sheet2 7 77 "0- lNvENToR. Z7 Fria/fm( n. ('aff//va (0J ATTORNEY.

Dec. 15, 1942. F. w. coFFlNG Re- 22,237

FREE-CHALN PLANETARY HOIST Original Filed 061'.. 8, 1937 4 Sheets-Sheet4 INVENTOR. fkf/v/cx 144 (aff/N6.

ATTORNEYS.

Reiseued Dec. 15, 1942 FREE-CHAIN PLANETABY HOIST Fredrick W. Comng,Danville, Ill.

Original No. 2,269,438, dated January 13, 1942, Serial No. 167,959,October 8, 1937. Application for reissue March 6, 1942, Serial No.433,680. In Great Britain September 8, 1937 17 Claims.

This invention relates to a chain or like hoist capable of free-chamaction, embodyin a planetary type mechanism, a brake mechanism, a speedcontrol or governor mechanism and which is hand operable for loadelevating and lowering and hand controlled.

This invention is a radical improvement upon certain prior patentedstructures such as illustrated in the prior Patents No. 1,862,331 datedJune 7, 1932; No. 1,937,331 dated November 2, 1933; No. 1,973,844 datedSeptember 18, 1934; No. 1,999,036 dated April 23, 1935; and No.2,044,565 dated June 16, 1936, and the pending application Serial No.755,259 led November 30, 1934, entitled Free-chain hoist, allowedFebruary 25, 1937, now Patent No. 2,099,676 dated November 23, 1937.

This invention also is an improvement upon that disclosed in the pendingapplication Serial No. 49,919, filed November 15, 1935, entitledFreechain planetary hoist, now Patent No. 2,150,419 dated March 14,1939.

This invention includes the basic features of a brake mechanism, a speedcontrol or governor mechanism, and a planetary mechanism.

The chief object of the invention is to produce a hoist which will havea highly desirable safety factor arrangement and which is capable offreechain action, when desired, in either direction.

Another object of the invention is to produce a load hoisting structurehaving parts capable of selective association to vary the Speed andcapacity thereof as hereinafter set forth.

The chief feature of the invention is the hoist which is capable ofaccomplishing the chief object.

The full nature of the invention will be understood from theaccompanying drawings and the following description and claims.

In the drawings Fig. l is a central sectional view through` a hoistembodying the present invention, the load chain being omitted andextreme ends of the supporting hook and operating handle being omittedfor clearness, a member of the latter being shown in position to actuatethe brake mechanism.

Fig. 2 is a side elevational view looking at the handle end of thehoist, parts of the Supporting hook and the handle being omitted andother parts of the handle mechanism being broken away to show the samein section and to illustrate other parts more fully, dotted linesindicating the chain passage, sprockets and chain portions.

Fig. 3 is an elevational view of the immediate brake operating andcontrol mechanism, parts being broken away to show the same in sectionand to illustrate other portions of the same and other parts more fully.

Fig. 4 is a similar view of the selective manual control for theplanetary clutch arrangement, whereby free-chain lowering without theload is possible. v

Fig. 5 is a transverse sectional view of the extended portion of thehousing associated with the parts illustrated in Figs. 3 and 4.

Fig. 6 is an elevational view of the governor or speed controlmechanism.

Fig. 7 is a side elevational view of a portion of the hoist, a portionof the handle being broken away and sectioned to show other portionsthereof in greater detail, the brake actuating handle member being shownin non-actuating position.

Fig. 8 is a central sectional view of another form of the presentinvention.

Fig. 9 is a. side elevation thereof.

Fig. 10 is a sectional view taken on line III-I3 of Fig. 8 and in thedirection of the arrows and of the one-way clutch shown therein.

Fig. 1l is a central sectional view of another form of the invention andsimilar to that shown in Figs. 8 to 10, inclusive.

Fig. 12 is a side elevation thereof.

In Figs. 1 to 7 of the drawings, I0 indicates one portion of a housing,and I I a complementary cover forming portion thereof. The two aresuitably secured together as at I3. The two form a chamber Il forreceiving the head I5 of a supporting hook I6 having the cylindricalportion I1 swiveled in the bearing Ia and lab.

The two portions I0 and II of the housing and cover also provide achamber I9 in which is mounted a load chain engaging sprocket 20 carriedby the shaft 2| and herein the two are shown integral. The cover portionII has an outwardly directed hub portion 22 which rotatably supports theportion.23 of the shaft 2l. The shaft isfurther extended at 24 androtatably supports the hub portion 25 of the body portion 26 of thehandle structure having theextended` portion 2l. The body portion 26 ofthe handle is extended toward the cover as at 28 and telescopes, as itwere the adjacent portion 22a of the cover, as shown clearly in theupper right hand portion of Fig. l.

The shaft portion 2I-see Fig. 1--as well as portions 23 and 24 areprovided with aligned and communicating lubricant receiving passages 29,30 and 3l, respectively, the latter being threaded to receive a closurein the form of a vcap screw 32 bearing on a washer 33 that engages theouter end 34 of the hub portion 25 oi' the handle. By this means thehandle is not only detachably associated with the hoist structure butlubricant may also be supplied to the interior mechanism to whichreferencewill be had hereinafter, which mechanism includes a planetarysystem.

The lower part of chamber |9 is open as at 35. In aligned bearings 36aand 36h formed in housing I0, and cover and housing I|, respectively, ismounted a shaft 31 which rotatably supports an intermediate sprocket orgear 38, therev being interposed therebetween an anti-frictionconstruction in the form of rollers and the like 39.

The purpose of this intennediate sprocket or gear will be hereinafterset forth.

'I'he housing I0 includes a depending well portion 40 while thecoverincludes a depending portion 4|. The aligned apertures 42a and 42h inthe well portion and 43 in the depending portion 4|, rotatably support ashaft 44. The cover plate 45 is suitably secured as at 46 to the wellportion 49 and closes the same.

The housing I8 includes chamber 41 which is closed by a cover plate 48suitably 'secured to the housing'as at 49 and said cover plate 48 isrecessed as at 5U to provide a closed bearing which receives ananti-friction structure 5| in the form of a ball race, or the like, forrotatably supporting the shaft portion 52. As previously set forth,shaft portion 23 is rotatably supported in the hub portion 22 of thecover and housing member The shaft portion 2| which projects through thepartition portion 53 of the housing i is enlarged as at 54 and isrotatably supported by the inwardly directed hub portion 55 on partition53. This hub portion 55 constitutes the rotatable support for theprimary shaft 2| with which is associated the handle structure,previously briefly mentioned.

snoobly associated with the lug portion 1s on the weight 12.

The opposite end oi' each shoe portion 61 is pivotally connected as at11 to the free end of the other lever arm 1| and counterweight12. Ifdesired, one or more springs 18 may be associated with the weighted armsas at 19 and anchored to the plate portion 99 as at 89. Substantiallythe same form of centrifugal operable speed control is illustrated inFig. of

application Serial No. 49,919. For a more complete description of theoperation of the same per se reference is made thereto.

The extended end 54 of this primary shaftsee Fig. 1--is recessed at 56and receives the end 59 of the shaft 59, the two shafts being rotatablyassociated together by the anti-friction structure, such as the rollers51. This shaft 52, 58, 59 is the supplementary shaft and with it isassociated the planetary transmission, brake mechanism and the speedcontrol or governor mechanism hereinafter described. f

A plate 60--see Fig. 1-has a hub portion 6| keyed as at 62 or otherwisesuitably secured to the supplementary or secondary shaft 59. Concentrictherewith and integral with plate 68, is

a brake drum structure 63. Operatively associated therewith is a brakeband 64 provided with brake lining ,65, or the equivalent. Referencewill be had hereinafter to the brake operating structure per se,although it is to be understood the brake band substantially encirclesthe brake drum`-'see Fig. 3.

At the extreme left hand portion of Fig. 1 is illustrated the speedcontrol and the same is lmore fully illustrated in Fig. 6. In saidfigure 66 indicates a suitable friction lining; or the like, carried bythe-shoe portions 61, each of which has onen? connected at 68 to a link69 pivotally connec at 10 to the plate 60. An arm 1| also is pivotallyconnected as at 10 to the plate Rotatably supported on the hub portion55 of Fig. l-is the external'planetary gear housing 8| having externalratchet teeth 82 offset toward the left relative to the central support.This offset arrangement forms a chamber 83 closed by a press-fitted orotherwise suitably secured plate 84, ,the shaft 59 extendingtherethrough. Thus, lubricant supplied to the chamber 83 through theother'and primary shaft 2|-23-24 does not enter the chamber 41 exceptchamber portion 83 thereof enclosed Within and formed by the cover 84and the planetary member 8|.

The extreme left hand and exposed end of shaft 2| (portion 54)-see Fig.l-is provided with a plurality of keyways, four in number, of which twoare shown, receiving keys 85 that key the pinion support plate 86 to thehandle operable shaft 2|. Plate 86 supports the pinion shafts 81, eachof which rotatably supports a pinion gear 88. Press tted or otherwisesecured to the interior of portion |89 of the exterior or desired, theteeth 9| vmay be formed directly upon the interior of portion |89. Inthe rotation of shaft 2| (handle operable) for load elevating thepinions revolve about the shaft 59 having sun gear teeth B9 thereon. Insuch revolution of the pinion gears 88, the shaft 59, the speed controldevice and the brake structure do not rotate with the handle operableshaft 2 I, for the ratchet teeth 82 on housing 8| is arranged to a Wayspermit housing 8| to rotate with the sha 2 |-23- 24 in the loadelevating direction.

The foregoing also is suificient for an understanding of free-chainmovement in the load elevating direction when such movement is' desiredwhen there is no load on load chain |12.

The means for holding planetary member 8|- |89 against rotation in onedirection and permitting normal rotation in the opposite direction isshown clearly in Fig. 4. The locking dog or paw] 92 is supported on theshaft 93 carried at opposite ends by the well portion 40 of housing- 0.

key 91 or an equivalent device, as at 98 to the housing Ill or the wellportion 40 thereof. This spring structure normally retains the dog 92 incontact with the ratchet teeth 82 and permits the ratchet to rotatecounterclockwise, as shown in Fig. 4, but constrains dog 92 to preventreverse rotation of the ratchet, as shown in the same gure, unless thedog is Withdrawn from ratchet engagement which is accomplished asfollows:

The dog 92 includes a spring support 99 with which is associated aspring |88. The other end thereof is carried by a pull rod IDI thatextends through aperture |||2 in cover plate 45 of the well portion 4l.Said rod terminates in a finger piece |03.

It will be noted the draft, as indicated at |04, see Fig. 4, on the dogis such that the greater the tendency to rotate clockwise,'the greaterwill be the locking effort exerted by the dog. The dog is prevented fromdropping out of tooth engagement by spring 06. When finger piece |03 ispulled outwardly or downwardly, spring elongates, but the dog 02 is notreleased until the ratchet wheel has rotated counterclockwise sumclentlyto clear the associated ratchet tooth 02 from the pawl draft. Thereupon,spring 03 elongates and spring |00 releases the dog from the ratchet.

To maintain the dog 02 out of ratchet engagement, rod III-see Fig.4-carries pin |03a having ends normally slidable in slots I02a in thetube 45a carried by cover 45. 'I'he end of this tube 45a also is notchedtransversely as at IOIa. When pin |03a is seated therein, pawl or dog 32is held out of ratchet engagement. When released, the pin nests in slots|02a and spring |00 tends to hold same nested and spring 00 functions torestore the locking dog 92 to operative engagement with the ratchet.

If in the load elevating movement, there should occur a slight reversemovement of ratchet teeth 02, portion 33a of pawl immediately engagesthe adjacent surface of well 40, and prevents pawl tilting in acounterclockwise direction-see Fig. 4.

The combined planetary ratchet wheel when free from the dog, may rotatein either direction whereas previously it was free to rotate only in acounterclockwise direction.

Reference will now be had toFigs. 3 and 5, wherein the operating andsupporting mechanisms of the brake structure are more specificallyillustrated. The brake band 64, carrying the lining 05, if desired, hasone end |05 encircling shaft 93 supported by the well 40 and by theinterminate ear |01 rigid therewith--see Fig. 5. Any other desired formof brake band anchorage may be employed.

The other end of the brake band includes an elongated aperture |00. Onecurled end of the spring H0 is associated with the aperture. Theopposite curled end of spring I 0 is secured to the apertured end of athreaded member ||I having the externally exposed tool engageableportion |09 and having threaded engagement with the threaded aperture||2 in the well portion 40. The tension exerted by the brake band innormal operation is adjusted by member Il and such adjustment isretained by the nut ||3 threaded on member I and bearing upon the wellsurface.

An arm ||4, see Fig. 3, projects into the aperture |00 and is notched asat ||5 and is carried by shaft IIS supported by opposite sides of thewell structure 40, as shown in Fig. 5. Brake arm III is one arm of abell crank pinned as at ||1 to'the shaft IIB, the other arm I I0 thereofbeing pivotally associated with a pair of links H9' at |20. The oppositeends of said links are pivotally associated at |2| with arm or levermember |22 pinned or otherwise secured as at |23-see Fig. 5-to the shaft44 which, as before stated, is supported by the two depending Walls ofthe well portion 40 and by the depending -portion 4| of the cover andhousing member I I. 44 projects through the portion 4| and on itsprojecting or extended end has secured to it, as by pinning |24 or thelike, a lever arm |25-see Figs. 2, 5 and '1. The latter figure alsoshows rod |0| retained in ratchet dog locking-out position.

This shaft The handle 21-see Figs. 1 and 7-includes an offset recessedportionln which slidably supports a laterally projecting bolt |21normally projected toward the hoist body by spring |20, as hereinafterset forth. The handle supports a cover portion |23 apertured at |30 forthe manual control rod |3I, which is reciprocated longitudinally of thehandle. Rod |3| has the oil'set portion |32 and the end |33. f

An angular and stiff spring member |34 is carried by a power pawl,hereinafter to be described, and the spring has its free end aperturedas at |35 to receive the end |33, the angular portion of the latter andthe oiset portion permitting relative movement of the power pawl withoutinterference from the rod I3I. When, however, the rod |3| is actuated soas to cause the same to move upwardly, having reference to Fig. 7, theoifset portion |32 engages the angular member |34 and the wire member|36 slidably associated therewith and which is pivotally associated asat |300r with the bolt |21, causes the bolt |21 to be retracted so thatit moves toward the right in Fig. 7. This movement retracts the bolt |21so that the exposed end of the bolt no longer extends outwardly asumcient distance to engage a stop surface I 31, see Fig. 2, on thecover portion of the hoist.

The flat spring I30-see Fig. l-carried by the handle bears on theshouldered portion |2111 of the bolt |21 and further retracts the boltso that it clears the ledge and stop portion |31 and is ln position toengage the inclined portion 23R-see Fig. 2--of the member |39 pivoted onan extension of the shaft 31 that mounts the idler sprocket Bil-seeFig. 1. The opposite end of the member |39 is recessed as at |4| andstraddles, as it were, the lever arm |25 which is the brake actuatingarm. Thus, in the normal operation of the handle, which can move fromthe position shown in Fig. 2 counterclockwise until the handle engagesthe stop |06 on the cover portion, the bolt member |21-see Fig. l-isineiective for actuation. However, after the bolt member |21 engages thestop |31 on the cover portion, further movement in the load elevatingdirection is impossible. The brake mechanism is arranged so that it willonly function for load lowering when it is actuated by means of the bolt|21 clearing the stop |31 and tilting the lever |33 for tilting theshaft 44 through portion |25, which releases the brake mechanism throughlever III-I |8- see Fig. 3.

The handle structure herein disclosed is similar to the handle structureshown in Patent No. 1,937,331-see Figs. 4 to 6 thereof. Rod |3| see Fig.l-herein is similar to rod 35-I35 shown in said patent, except in thisinstance, the end of rod |3| is offset. Member |36 herein is similar tomember 9| of the patent. Plate 34 of said patent disclosure is similarto plate |34 shown hereinsee Fig. 7. Spring |20 is the equivalent ofspring 32 of said patent and has a similar function in that itconstrains the power pawl |43, pivotally supported by the handle, towardengagement with the ratchet teeth |42-see Fig. 1. In the presentinstance, these ratchet teeth on the shaft 2| are designated by thenumeral |42. In the patent, the ratchet teeth are designated by thenumeral 20 and are a part of the shaft I6. The function of the powerpawl |43 carried by the handle 21v is substantially the same as that ofthe power pawl 3| shown and described in Patent No. 1,937,331.

The spring |20 actuates this pawl indicated in Fig. l by the numeral Iand carrying the portion I, pivotally supported as at |45, issubstantiallythe same as the pawl 2| carrying the stop 59 and pivotallysupported at Il. illustrated in Fig. of said patent. However, in thepresent instance, spring |00 normally constrains4 the plunger member |21toward its seated position without load on the chain, for the reasonshereinafter set forth, the rod III-see Figs. 2, 4

and 'I-is pulled outwardly and if'it is not deand thereby differentiates`from the spring shown in Fig. 4 of the before mentioned patent, whichis constrained in the opposite direction. In other words, spring |20 inthis instance, has the same function that the ringer piece 8| has in theaforesaid basic patent disclosure. By reason of this simplification, theshoulder 85 and the curved portion |3I of the pawl of the patent are notrequired. The mechanism ior reciprocating the rod |3| and carried by thehandle near the free end thereof is substantially that shown in thebroken away portion immediately and `to the left in Fig. 4 of Patent No.1,937,331, and is not duplicated herein, although it or equivalentmechanism is comprehended within the present invention.

The load chain |12 in Fig. 2 is shown having one end and the surplus endsecured to the boss |1| on the housing. The chain |12 for load loweringpasses inwardly into the opening |13 forming the communication to thechamber I9. The chain then engages the sprocketl 20 and then passesdownwardly and outwardly, as shown immediately to the right in Fig. 2.This is the simple or single-line chain operation.

From the foregoing, referring to the hoist operation per se, aspreviously pointed out, the chain |12, when relieved from load, may bepulled through the hoist in the load elevating direction remainstationary. For load elevating, reciprocation of the handle causesrotation of the load or power sprocket 20 and as before stated-sec Fig.l--during this operation the brake mechanism and the governor mechanismremain stationary.

In order to lower the load, the rod |3| is actuated and the handletilted further to tilt lever IBS- see Fig. Z-Which releases the brake tothe desired degree, dependent upon the amount of tilting of member |39.Thus, the operator has control of load lowering. Should the speed oflowering, due to the operators ignorance or carelessness, exceed thatfor which the hoist is adjusted for safety, the governor structureautomatically becomes operable and the counterweights--see Fig. S-causethe shoes to engage the adjacent braking portion of the hoist to retardthe rate of lowering to that for which the centrifugal governorisadjusted.

In this load lowering the pawl 92-see Fig. 4 -due to the reversal of therotation of the ratchet wheel, engages one of the teeth thereof and doesnot ratchet relative to the wheel, and, therefore, holds the planetaryhousing 8| so that the pinion gears rotate within and revolve around inthe ring gear 9| which causes the brake supporting shaft and thegovernor supporting -shaft to rotate through the planetary system.

Therefore, in load lowering under load and controlled through thehandle, the brake mechanism as a free-chain structure and the handle mayy `sired to hold it outwardly manually. the rod is turned a quarter turnand the pin Ilia is seated in the notches |0|'a-see Figs. 7 and 4- holdsthe spring |00 extended and pawl 92 out oi'Y ratchet engagement.

If there be load on the chain, the locking dog 92 will not release fromthe ratchet due to the draft before mentioned-see Fig. `4. Reverserotation of the ratchet, therefore, is required but i only toasuflicient degree to clear the draft interlock on the pawl and whenthat clearance is effected, the pawl 92- is released by its spring |00inopposition to spring 96 and is withdrawn and held out of ratchet toothengagement. Then the chain may be operated as a free-chain in the loadlowering direction. In this free-chain movement, the brake mechanism isstationary and, therefore, the governor structure is not operable andthe sun gear accordingly remains stationary so that the pinions and thering gear rotate with the load or power sprocket.

The load may be held in suspended relation by the handle being movedinto position so that the plunger |21 does not engage the lever |35Which actuates the brake and the brake mechanism thus is retained inbraking position, and the handle is prevented from being rotated in a`direction opposite to the load elevating direction because the pawl 92engages the ratchet and holds the ratchet stationary. Dropping of theload cannot be accidentally effected as long as there is weight or loadon the chain because of the draft |04 on the pawl 92. The chain withoutload only can be dropped intentionally by releasing the pawl 92 asaforesaid and operating the handle 21 to free its pawl from its draftlock. Thereupon the chain will escape and drop, and the handle, if movedat all, will only swing upwardly in a. counterclockwse direction untilit engages the stop |06.

In the form of the invention illustrated in Figs. 8 and 9, numerals ofthe three hundred series indicate parts identical with or similar tothose of the primary series illustrated in Figs. l to 7 movement in theload lowering direction and inclusive. Numerals of the four hundredseries have been utilized without regard to the primary series ofnumerals.

This form yof the invention incorporates a chain and wheel as a sourceof power in place of the ratchet operating lever handle type shown inFigs. l to 7, and a chain guard. In Figs. 8 and 9 the power is appliedto the load chain sprocket through the planetary system in a mannerbroadly similar to that illustrated in application Serial No. 49,919.Thev present form of the invention includes the governor or speedcontrol structure as well as the braking structure, both, however,operative relative to the load chain through the planetary system. Thebraking structure and planetary release mechanism is similar to thatillustrated in the 4ilrst illustrated form of the invention, butoperable by means associated with the chain power wheel dissimilar tothat of the handle lever associated means shown herein.

In the present form of the invention, load sprocket" 320 is rigid withshaft 32| within which is mounted shaft 324 in turn rigid with shaftportion 359. The braking structure includes drum 203 and plate 300rotatably mounted on shaft 350. A one-way clutch structure locks theplate 360 to the shaft 359-324 in load lowering movement but permits,without such locking, free rotation of said shaft 353 in load elevatingdirection as follows:

Similar to the disclosure in Figs. 2 and 4 of application Serial No.49,919, Figs. 8 and 10 herein disclose a ratchet 433 rigid with shaft353 by the key 451 and having teeth 439 engaged by pawls or dogs 412pivoted at 413 on the inside faoe of Dlate 350 and angle brackets 413esecured to plate 380 at 413b. Springs 41| secured at 415 and 415e to theplate 350 normally constrain dogs 412 into ratchet tooth engagement andpermit relative rotation in load elevating direction but preventrelative rotation in the load lowering direction.

As disclosed in Fig. and the last mentioned application, a plurality ofpairs of pawls are provided and the spacing between adjacent pawls ofdifferent pairs is unequal for the purpose mentioned in saidapplication.

Shaft 353 has teeth 333 constituting the sun gear meshing with pinions30B rotatable on trunnions 331 carried by plate 385 keyed as at 305 toshaft 32|. When the ring gear 390 is held against rotation by theholding pawl (similar to pawl 32 in Fig. 4) engaging ratchet teeth 382of member 33|, load gear 320 is rotated through the planetary system forload elevation. This arrangement, while operating to elevate loads at aslower rate than the first form ofthe present invention, is capable ofelevating greater loads for the same effort applied to the shaft 324 asis applied to shaft 24.

In this form of the vinvention the braking structure and governorstructure are normally ineffective during load elevation, but areeffective for load holding and/or in load lowering.

Portion 354 of shaft 32|, see Fig. 8, is rotatably supported on shaft324 by rollers 351 at one end and by rollers 405 at the other end. Shaft32| is also rotatable at one end in bearing 355 of partition plate 353and in bore 322 of housing 3|| at 323. An Alemite lubricator 405 isassociated with passage 401 to supply lubrication.

Keyed as at 408 to the exposed end of shaft 324 is hub 403 of a ratchet4|0 having teeth 4| I. Washer 334 and nut 332 retain the ratchet on theshaft 324. Encircling hub 403 are rollers 4|2 supporting hub 4|3 of thechain wheel 4|4 having the chain groove periphery 4|5. Seated therein isthe transverse link endless chain 4|5 retained therein and on the wheelby chain guard 4|1-see Fig. 9-having arms 4|8 rigid with housing 3| I.

A pawl 4|9-see Fig. 9-having tooth 420 is pivoted at 42| in bracket 432esecured at 423 to the wheel 4|4. In counterclockwise or load elevatingrotation of wheel 4|4, the tooth 420 engages the adjacent ratchet tooth4|| of ratchet 4|0 so that shaft 324 rotates to transmit power throughthe planetary system to the load chain sprocket 320 to elevate the load.The ratchet clutch shown in Fig. 10 permits such movement without brakerelease or governor action. The pawl associated with the planetary gearhousing ratchet teeth 302 has its usual function at this period ofoperation. It is not specifically illustrated herein because it issimilar to pawl 92 shown in Fig. 4. The brake control mechanismsee Fig.9-is associated therewith in a similar manner and herein control parts40|a, 40|, 402a, 433 and 4|l3a are similar to the corresponding onehundred series numbered parts shown in Figs. 3, 4 and 7. Member IUI-|03controls this pawl, not shown, but associated with ratchet 382.

Shaft 344-see Fig. 8is the brake control shaft similar to shaft 44 shownin Figs. 1. 2. 3. 5 and 7, and on its free end is mounted the hub of arm425. Arm 425 is recessed at 425. A plun- 8er 42m-see Fig. 9-is slidabletherein and is projected outwardly by spring 421 also seated in socketor recess 425. Plunger 423e includes a tooth portion 423 with relievedface 420. A pin 430 is secured to plunger 425e and rides in slot 43| inarm 425.

Pawl 4|3-see Fig. 9-includes a tooth 432 and an approach cam face 433.In the load elevating movement (counterclockwise rotation) of wheel 4|4the pawl 4I9 has its cam face 433 engage relieved face 423 of plunger42Go and depresses the latter without rocking lever arm 425. Spring II0, see Fig. 3, normally constrains shaft 44 and arm |25 toward theright-see Fig. 2. Arm 425 in a similar manner is constrained toward thePosition shown in Fig. 9.

When it is desired to hold the load in elevated position, all parts arepositioned as shown. When it is desired to lower the load, wheel 4|4 isreversed until tooth 432 engages toothI 423. Continued reverse rotationthereupon tilts arm 425 counterclockwise to rock shaft 344 to releasethe brake mechanism to the desired degree dependent upon the amount ofreverse rotation. When brake release is effected, the speed control,naturally automatically becomes effective and prevents load droppingshould brake failure occur. Of course. if there is disengagement betweenmember 4|9 and 426a the brake mechanism immediately is effective forbraking.

A spring 440 carried by the wheel 4I4-see Fig. 9-normally constrainspawl 4|9 into ratchet engagement. In the reverse rotation of the wheel4I4 for brake release, if the load is positioned immediately adjacentthe hoist, the power ratchet and pawl connection permits the load toremain stationary while the wheel is reversely rotated to cause pawl 4 9to engage plunger 4260..

In Figs. 1l and l2 there is illustrated an improved and safer form ofthe invention illustrated in Figs. 8 to 10, inclusive. Numerals of thefive and six hundred series indicate parts identical or similar to thoseillustrated in Figs. 8 to 10 by numerals of the three and four hundredseries,. respectively.

Since the brake mechanism, speed control mechanism, planetary mechanism,immediate brake releasing mechanism, one-way ratchet clutch mechanism,combination ratchet and ring gear mechanism, and power applyingmechanism herein are substantially identical to that illustrated inFigs. 8 to 10, no further description thereof is believed necessary.

The present form of the invention shows the "Alemitc" fitting 606 andsupply passage 601 positioned opposite that shown in Fig. 8 since inFig. 11 the cover housing 5I| supports an arcuate guard 693 thatpartially envelopes offset portion 698 of the chain power wheel 6|4.This guard, having reference to Fig. 12, is discontinuous for the lowerleft hand quadrant portion of the power wheel t0 provide clearance forthe brake release mechanism.

Herein also-see Fig. ll-between collar 555 and portion 554 is interposedan anti-friction device 631. Similarly between hub portion 523 andbearing portion 522 there is interposed an anti-friction device 595.

In this form of the invention the chain guard SI1 instead of beingsuperposed relative to the chain wheel is reversed relative thereto-,seeFig.

12--and the powerjchain IIB passes between the supporting arms IIBthereof.

Herein inner shaft 624 is longitudinally bored as at 695l and the outerend thereof is threaded at B94 to receive a headless threaded closureG93. 'Ihe opposite and closedend of the bore com- ,municates by ducts692 with' the clamber 583. In this manner, lubricationcan be supplieddirectly to the interior of the planetary system. This lubrication maydiffer. if desired, from that supplied to the other and associated partsby the fitting 606.

The major improvement, however, is in that portion of the inventionwhich is interposed between the power` transmitting and brake actuatingpawl 6i! and the brake operating shaft 5M and the adjacent cooperatingparts carried thereby.

In this form of the invention-see Fig. 12- pawl 6|! includes the toothportion G32relieved as at 633 for the purpose described.- `Pawl 6|9 ispivotally supported at 62 I' on the offset bracket 632a secured at 623to the power wheel portion Bil. Pawl BIS includes tooth 620 and theadjacent end of the pawl is squared as at 620er. Spring 640 normallyconstrains the pawl Vinto ratchet tooth engagement.

The housing H at 5I Ia-see Fig. lz-includes a stop portion, the purposeof which will be set forth hereinafter. The lever portion 625 carried bythe free end of brake releasing shaft 544-see Figs. 11 and 12-mounts thespring pressed plunger 629 so formed on its projecting portion that whenengaged by portion 633 of the pawl in counterclockwise rotation of thepower wheel,

the plunger is forced inwardly into the socket in said arm 825.

Upon reverse rotation of the power wheel for load lowering and brakerelease, tooth B32 engages the projecting face of plunger VS29-see Fig.12-and continued rotation of the power wheel tilts lever 625 to rockshaft 544 to secure brake release in the manner previously describedherein. The resistance to such tilting tilts pawl GIS until in Vthecontinued rotation of the power wheel, portion 620s of the pawl engagesstop 5| la and further reverse rotation is prevented. This stopengagement prevents shearing or breaking off of the projecting end ofthe plunger B29.

While the invention has been described and illustrated in great detailin the foregoing description and drawings, the same is for example onlyand not in sense restrictive in character.

The several modifications illustrated and described. as well as otherswhich will readily suggest themselves to persons skilled in this art,are all considered to be within the broad scope of the invention,reference being had to the appende claims.

'I'he invention claimed is:

1. In a reversing hoist, a handle, a ratchet engageable pawl pivotallysupported on the handle, an arm carried by the pawl, a lever operablerod for tilting the arm for pawl movement, a longitudinally movablehoist control member carried bythe handle and bodily movable parallel tothe pivotal axes of the pawl and handle, means opposing rod tilting ofthe pawl, a tiltable lever carried by the member and associated with theann for tilting said lever and securing longitudinal movement of themember, and means opposing the effect of the first mentioned means andassociated with the member.

2. In a hoist structure, the combination of a power operable shaft, aload chain engageable sprocket thereon, a planetary transmissionincluding a sun gear, planetarypinions, a carrier therefor rigid withthe shaft, a ring gear, the pinions being revolvable about the sun gearin the rotation of the power shaft when the sun gear is rotatabletherewith, a supplementary shaft rigid with the sun gear, a brake drumalso rigid therewith, a housing enclosing all of the aforesaid, a brakeband for the brake drum normally constrained to lock the sun gear shaftto the housing, a ratchet mechanism operatively associated with the ringgear of the planetary system, and pawl means normally constrained toratchet engagement and when engaged permit-` ting power shaft andratchet rotation in load elevating direction without sun gear rotation,said pawl means when disengaged from the ratchet permitting sun gearrotation with power shaft rotation in the load lowering direction uponremoval of brake band constraint.

3. A device as defined by 'claim 2, characterized by the addition of aspeed governor including centrifugally operable means rotatable with andby the sun gear auxiliary shaft and rotation retarding means operativelyengaging the housing for retarding the sun gear auxiliary shaft, powershaft and brake drum rotation in load lowering direction uponpredetermined speed thereof in load lowering direction.

4. In a hoist structure, the combination of a power shaft having achannel extending therethrough, means closing one end of said shaft, apower member for rotating said shaft and detachably associated therewithand retained in associated relation by said closing means. a planetarytransmission including a sun gear, sun gear shaft, planetary pinions, aring gear and a pinion support, the ring gear having a chamber formationfor nesting the planetary pinions and sun gear, the power shaftextending into said chamber and having operative connection with thepinion support for rotation of the pinions with and by the power shaft,said passage communicating with said chamber, and closure meansinterposed between the sun gear shaft and the ring gear for retaininglubricant in said chamber.

5. In a hoist, the combination of a power shaft and load elevating meansthereon, a handie having a pawl and engaging a ratchet operativelyconnected with said shaft, a brake normallyconstrained to brakeoperation, a one way clutch between the brake structure and the powershaft permitting shaft operation in load elevating direction withoutbrake operation or movement, said clutch connecting said power shaft andbrake for braking or holding of the power shaft when not power rotated,means in juxtaposition to the handle and engageable thereby andconnected to the brake, said means, operating the brake in opposition tothe brake constraint to permit load lowering, and manually operablehandle supported 'means permitting or preventing the last mentionedengagement as desired.

6. In a hoist including a ratchet, a power shaft, manual means forrotating the shaft in one direction, a pawl carried by the means forratchet engagement and shaft rotation, `a brake structure operativelyassociated with the shaft, and brake operating mechanism controlled bythe means including a rock-shaft, an operating arm thereon, a lever foroperating said arm to operate said brake, and other means carried by thefirst mentioned means and manually controlled thereby for leverengagement for brake operation.

7. In a hoist, the combination of a two-part sion on one of the housingparts. said last meny tioned housing part including a partition fromwhich the shaft extends, operating mechanism within said secondmentioned chamber, a detachable closure for the latter, a. well portiondepending from the second mentioned chamber forming portion, and aclosure for the well portion.

8. A device as defined by claim '7, characterized by the addition of anoperating shaft having operating means within the well portion andprojecting therefrom and toward the other housing portion, and aprojecting portion on the other housing portion including a bearing forsaid well projecting shaft.

9. In a hoist, the combination of an elongated flexible, load elevatingand lowering means, rotatable means for moving same, a power shaft forrotating said rotatable means, a planetary system operatively associatedwith the shaft, a ratchet directly associated with the planetary ringgear, a pawl normally constrained to ratchet engagement and permittingring gear rotation in one direction and preventing reverse rotationthereof, means operable in opposition to the constraint for withdrawingthe pawl from ratchet engagement to permit ring gear rotation in thereverse direction, and means normally arranged to prevent lateralmovement of the last mentioned means on pawl release and capable oflocking said means in pawl release position when intentionally movedthereto.

10. A hoist as defined by claim 9, characterized by the pawl and theratchet teeth having complementary draft formations whereby the -teethare mutually self-locking in one direction,

pawl tooth withdrawal from ratchet tooth engagement requiring initialrotation of the ratchet in ratcheting direction for freeing the pawlfrom ratchet locking association for subsequent rotation of the ratchetin the reverse direction.

11. A device as defined by claim '7, characterized by the addition of anoperating shaft having operating means Within the well portion andprojecting therefrom and toward the other housing portion, a projectingportion on the other housing portion including a bearing for said wellprojecting shaft, and means operable by the coaxial means for operatingsaid last mentioned operating shaft.

12. In a chain hoist including a pivotally mounted handle, a ratchetincluding power shaft, a. chain sprocket rotatable by said shaft, a pawlcarried by the handle for ratchet engagement and shaft and sprocketrotation in handle movement, a band including brake structure adaptedfor operative connection to the shaft and sprocket when tending to lowerthe load but normally inoperative upon the shaft and sprocket 'in loadelevation, a second ratchet adapted for operative connection to thesprocket, a second pawl means normally constrained to second ratchetengagement and permitting second ratchet rotation in load elevation bythe sprocket and preventing reverse sprocket rotation for load holdingpurposes, manually operable means for releasing the second mentionedpawl means from second ratchet engagement to permit reverse sprocketrotation in load lowering, and brake operating means controlled by thehandle including a rockshaft, an operating arm thereon, a lever foroperating said arm to release the band of said brake structure, andmeans carried by the handle and manually controlled thereby for leveroperation for brake band release when the second mentioned pawl meanshas been released from second ratchet engagement to permit sprocket loadlowering rotation.

13. In a chain hoist including a pivotally mounted handle, a ratchetincluding power shaft, a chain sprocket rotatable by said shaft, a pawlcarried by the handle for ratchet engagement and shaft and sprocketrotation in handle movement, a band including brake structure adaptedfor operative connection to the shaft and sprocket when tending to lowerthe load but normally inoperative upon the shaft and sprocket in loadelevation, a second ratchet adapted for operative connection to thesprocket, a second pawl means normally constrained to second ratchetengagement and permitting second ratchet rotation in load elevation bythe sprocket and preventing reverse sprocket rotation for lcadholdingpurposes, manually operable means for releasing the second mentionedpawl means from second ratchet engagement to permit reverse sprocketrotation in load lowering, and brake operating means controlled by thehandle including a rockshaft, an operating arm thereon, a lever foroperating said arm to release the band of said brake structure, meanscarried by the handle and manually controlled thereby for leveroperation for brake band release when the second mentioned pawl meanshas been released from scond ratchet engagement to permit sprocket loadlowering rotation, a centrifugally operable speed governor, and aplanetary structure, the brake structure and speed governor having anoperative connection to the sprocket through said planetary structurewhereby the load lowering sprocket speed is multiplied for governorspeed operating purposes.

14. In a chain hoist including a pivotally mounted handle, a ratchetincluding power shaft, a chain sprocket rotatable by said shaft, a pawlcarried by the handle for ratchet engagement and shaft and sprocketrotation in handle movement, a band including brake structure adaptedfor operative connection to the shaft and sprocket when tending to lowerthe load.v

but normally inoperative upon the shaft and sprocket in load elevation,a second ratchet adapted for operative connection to the sprocket, asecond pawl means normally constrained to second ratchet engagement andpermitting second ratchet rotation in load elevation by the sprocket andpreventing reverse sprocket rotation for load holding purposes, manuallyoperable means for releasing the second mentioned pawl means from secondratchet engagement to permit reverse sprocket rotation in load lowering,and brake operating means controlled by the handle including arockshaft, an operating arm thereon, a lever for operating said arm torelease the band of said. brake structure, and means carried by thehandle and manually controlled thereby for lever operation for brakeband release when the second mentioned' pawl means has been releasedfrom second ratchet engagement to permit sprocket load loweringrotation, a centrlfugally operable speed govergear of the planetarystructure and the second mentioned ratchet being rigid with each other.15. In a chain hoist including a pivotally y mounted handle, a ratchetincluding power shaft,

a chain sprocket rotatable by said shaft, a pawl carried by the handlefor ratchet engagement Atn and shaft and sprocket rotation in handlemovement, a band including brake structure adapted for operativeconnection to the shaft and sprocket when tending to lower the load butnormally inoperative upon the shaft and sprocket in load elevation, asecond ratchet adapted for operative connection to the sprocket, asecond pawl means normally constrained to second ratchet engagement andpermitting secon'd ratchet rotation in load elevation by the sprocketand preventing reverse sprocket rotation for load holding purposes,manually operable means for releasing the second mentioned pawl meansfrom second ratchet engagement to permit reverse sprocket rotation inload lowering, and brake operating means controlled by the handleincluding a rockshaft, an operating arm thereon, a lev'er for operatingsaid arm to release the band of said brake structure, and means carriedby the handle and manually controlled thereby for lever operation forbrake band release when the second mentioned pawl means has beenreleased from second ratchet engagement to permit sprocket load loweringrotation, a centrifugally operable speed governor, and a planetarystructure including a sun gear,

` the brake structure including a drum, said brake structure and speedgovernor having an operative connection to the sprocket through saidplanetary structure whereby the load lowering sprocket speed ismultiplied for governor speed operating purposes, the sun gear of theplanetary structure and the drum of the brake structure being rigid witheach other.

16. In a chain hoist including a plvotally mounted handle, a ratchetincluding power shaft, a chain sprocket rotatable by said shaft, a pawlcarried by the handle for ratchet engagement and shaft and sprocketrotation in handle movement, a band including brake structure adaptedfor operative connection to` the shaft and sprocket when tending tolower the load but normally inoperative upon the shaft and sprocket inload elevation, a second ratchet adapted for operative connection to thesprocket,

a second pawl means normally constrained to second ratchet engagementand permitting second ratchet rotation in load elevation by the sprocketand preventing reverse sprocket rotation for load holding purposes,manually oper-- able means for releasing the second mentioned pawl meansfrom second ratchet engagement to permit reverse sprocket rotation inload lowering, and brake operating means controlled by the handleincluding a rockshaft, an operating arm thereon, a lever for operatingsaid arm-to release the band of said brake structure, means carried bythe handle and manually controlled thereby for lever'operation for brakeband release when the second mentioned pawl means has been released fromsecond ratchet engagement to permit sprocket load lowering rotation, acentrifugally operable speed governor, and a planetary structureincluding a sun gear and a ring gear, the brake structureincluding adrum, said brake structure and speed governor 'having an operativeconnection to the sprocket through said planetary structure whereby theload lowering sprocket speed is multiplied for governor speed operatingpurposes, the ring gear of the planetary structure and the secondmentioned ratchet being rigid with each other and the sun gear of theplanetary structure and the drum of the brake structure being rigid witheach other. f

17. In a free-chain hoist, including ra housing, a load chain dependingtherefrom, chain moving means within the housing including power shaftmeans having an end exposed exteriorly of the housing, a controlmechanism operatively connected to said chain moving means for loadlowering control and within the housing and including a control memberprojecting from the housing, a supplementary shaft means within thehousing, a centrlfugally operable governor structure within the housingand operatively interposed between said supplementary shaft means andsaid housing for variably engaging same and governing load lowering, aplanetary system within the housing ,and operatively interposed betweenthe supplementary and the housing and with a one-way clutch connectionto the latter, said system operatively connecting said power shaft meansand said supplementary shaft means, a power means on the housing exposedend of the power shaft means, and housing exposed means operatively"ssoclated with the power means for directly rotating said power shaftmeans in a load' elevating direction, said planetary system in loadlowering being effective through said governor structure for increasingthe safety factor of v the hoist.

FREDRICK W. CoFFmG.

shaft means

